python - modify/access python instance from external script or command

Question

I have a main python code running (at startup) with an instance of a class in it. I would like to be able to modify this instance (its arguments) when I want (as a user). The idea is to be able to modify it without disturbing the main code or forcing it to read an external script every 2 seconds. So, I would be able to run a bash command or a new python script that will modify this instance created in the main running script.

I use python 3 and already though/tried different things:

• write a method with an opened socket listening in the class corresponding to the instance. Seems overkill to me.
• be able to access the instance from its memory address with some tools such as ctypes and id. But I got errors in this way (Segmentation fault)

from terminal 1:

>>> a='c'
>>> hex(id(a))
'0x7fc9f825a378'

from terminal 2:

>>> import ctypes
>>> d = (ctypes.c_char).from_address(0x7fc9f825a378)
>>> d
Segmentation fault (core dumped)

So, how can I modify an instance in a running script from my archlinux os as a user?

Thanks a lot for your time

标签： pythoninstanceexternal

Answer 1

我确实查看了有关 python 共享内存的所有信息。但是我没有找到任何解决方案来在我的 POSIX 系统上共享字典或“普通”数组。

• sysv_ipc或posix_ipc使用字符串缓冲区，使一切复杂化（需要解析）。

• 多处理允许这样做，但从同一个脚本，没有 id/key 可以从另一个 python 实例访问它。

• SharedArray这样做，但使用 numpy 数组。

你知道一个共享内存 python 库，它允许简单地共享一个对象，比如字典或普通列表吗？

谢谢你的时间。